Yep. I was fully expecting him to be substituted, certainly by the hour mark at the latest.
The only reason I can imagine in keeping him on was that despite the total lack of final product, he was at least finding himself in good positions to ultimately not deliver.
Perhaps sherwood felt that should another chance arise, it would have been taken.
Gabby should not be starting against Notts County, give some time to Ayew instead, get him further up to speed.